Alloy 925,Incoloy 925 Fittings,UNS N09925,E FORU

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 925 / Incoloy 925 Fittings (UNS N09925)** **Alloy 925** (commercially known as **Incoloy 925**) fittings are precision-engineered components manufactured from precipitation-hardenable nickel-iron-chromium alloy, designed for critical piping systems requiring exceptional corrosion resistance and high mechanical strength. These fittings provide reliable performance in aggressive environments, particularly in oil and gas, chemical processing, and marine applications where system integrity under extreme conditions is paramount. --- #### **1. Chemical Composition** The chemical composition of Alloy 925 fittings ensures optimal performance in corrosive environments: | Element | Content (%) | |:---|:---| | **Nickel (Ni)** | 42.0 - 46.0 | | **Chromium (Cr)** | 19.5 - 23.5 | | **Iron (Fe)** | 22.0 min | | **Molybdenum (Mo)** | 2.5 - 3.5 | | **Copper (Cu)** | 1.5 - 3.0 | | **Titanium (Ti)** | 1.9 - 2.4 | | **Aluminum (Al)** | 0.1 - 0.5 | | **Carbon (C)** | 0.03 max | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Sulfur (S)** | 0.03 max | | **Phosphorus (P)** | 0.03 max | *Note: The strategic combination of nickel-chromium provides fundamental corrosion resistance, while titanium and aluminum enable age-hardening through gamma prime precipitation. Molybdenum and copper enhance resistance to chloride-induced stress corrosion cracking and sour gas environments.* --- #### **2. Physical Properties** Alloy 925 fittings exhibit consistent physical properties: | Property | Value | |:---|:---| | **Density** | 8.08 g/cm³ (0.292 lb/in³) | | **Melting Range** | 1370 - 1400°C (2500 - 2550°F) | | **Coefficient of Thermal Expansion** | 14.2 × 10⁻⁶/°C (20-100°C) | | **Thermal Conductivity** | 11.5 W/m·K (at 100°C) | | **Specific Heat** | 448 J/kg·K (at 100°C) | | **Modulus of Elasticity** | 196 GPa (28.4 × 10⁶ psi) | | **Magnetic Permeability** | <1.005 (essentially non-magnetic) | --- #### **3. Mechanical Properties** **Standard Mechanical Properties (Aged Condition):** | Property | Value | |:---|:---| | **Tensile Strength** | 1035 MPa (150 ksi) min | | **Yield Strength (0.2% Offset)** | 860 MPa (125 ksi) min | | **Elongation** | 15% min | | **Reduction of Area** | 35% min | | **Hardness** | 269 - 321 HB | | **Impact Strength (Charpy V-Notch)** | 40 J min | **Pressure Ratings:** - **Working Pressure:** Up to 10,000 psi depending on fitting type and size - **Temperature Range:** -29°C to 650°C (-20°F to 1200°F) - **Safety Factor:** 4:1 minimum burst pressure to working pressure --- #### **4. Product Specifications** **Available Fitting Types:** - **Butt Weld Fittings:** Elbows, tees, reducers, caps - **Socket Weld Fittings:** Unions, elbows, tees - **Threaded Fittings:** NPT, BSPT, BSPP threads - **Flanged Components:** Orifice flanges, blind flanges - **Special Fittings:** Instrumentation, hydraulic, and subsea fittings **Size Ranges:** - **Butt Weld:** 1/8" to 48" NPS - **Socket Weld:** 1/8" to 4" NPS - **Threaded:** 1/8" to 2" NPS - **Pressure Ratings:** 2000 psi to 6000 psi --- #### **5. Product Applications** **Oil & Gas Industry:** - **Wellhead Components:** Christmas tree fittings, tubing heads - **Production Manifolds:** Flow lines, gathering systems - **Subsea Systems:** Connectors, jumpers, manifold fittings - **Sour Service Applications:** H₂S and CO₂ resistant fittings - **Refinery Piping:** High-pressure and high-temperature systems **Chemical Processing:** - **Reactor Systems:** Heat exchanger and reactor connections - **Process Piping:** Corrosive chemical transfer lines - **Distillation Columns:** Vapor and liquid line fittings - **Pressure Vessel Connections:** Nozzles and access fittings **Power Generation:** - **Boiler Systems:** High-pressure steam fittings - **Turbine Connections:** Steam and gas turbine piping - **Heat Exchanger Systems:** Shell and tube connections - **Geothermal Plants:** High-temperature brine systems **Marine & Offshore:** - **Seawater Systems:** Cooling water and fire water fittings - **Hydraulic Systems:** High-pressure hydraulic connections - **Ballast Systems:** Marine and offshore ballast piping - **Subsea Control Systems:** Underwater hydraulic fittings --- #### **6. International Standards** **Material Standards:** - **UNS N09925**: Unified Numbering System designation - **ASTM B564**: Standard Specification for Nickel Alloy Forgings - **ASTM B366**: Factory-Made Wrought Nickel Alloy Fittings - **ASME SB564**: ASME Boiler and Pressure Vessel Code - **MSS SP-43**: Wrought Stainless Steel Fittings **Dimensional Standards:** - **ASME B16.9**: Factory-Made Wrought Buttwelding Fittings - **ASME B16.11**: Forged Steel Fittings, Socket-Welding and Threaded - **ASME B16.5**: Pipe Flanges and Flanged Fittings - **ISO 9001**: Quality Management Systems **Industry Specifications:** - **NACE MR0175/ISO 15156**: For sour service applications - **API 6A**: Wellhead and Christmas Tree Equipment - **API 17D**: Subsea Production Equipment - **PED 2014/68/EU**: Pressure Equipment Directive --- #### **7. Corrosion Resistance** **Excellent Performance In:** - **Sour Gas Environments:** H₂S and CO₂ containing systems - **Chloride Solutions:** Superior stress corrosion cracking resistance - **Acidic Conditions:** Sulfuric, phosphoric, and organic acids - **Alkaline Media:** Good resistance to caustic environments - **Marine Environments:** Excellent pitting and crevice corrosion resistance **Corrosion Performance:** - **Critical Pitting Temperature:** >85°C - **NACE TM0177 Method A:** Excellent performance - **General Corrosion Rate:** <0.1 mm/year in most environments - **Galvanic Compatibility:** Suitable for mixed-metal systems --- #### **8. Manufacturing Processes** **Fabrication Methods:** - **Hot Forging:** For superior grain structure and strength - **Machining:** Precision CNC machining from bar stock - **Investment Casting:** For complex geometries - **Welding:** Fabricated from pipe and plate **Quality Processes:** - **Heat Treatment:** Solution annealing and aging per specifications - **Surface Treatment:** Pickling, passivation, and special coatings - **Non-Destructive Testing:** RT, UT, MT, PT as required - **Dimensional Inspection:** 100% dimensional verification --- #### **9. Installation & Maintenance** **Welding Procedures:** - **Processes:** GTAW (preferred), GMAW, SMAW - **Filler Metals:** ERNiFeCr-1 or equivalent - **Preheat:** Generally not required - **Post-Weld Heat Treatment:** Recommended for aged material - **Welding Qualifications:** Per ASME Section IX **Installation Guidelines:** - **Alignment:** Proper alignment to prevent stress concentration - **Support:** Adequate piping support near fittings - **Thread Sealing:** Compatible thread compounds recommended - **Gasket Selection:** Appropriate for service conditions --- #### **10. Quality Assurance** **Testing & Certification:** - **Material Certification:** EN 10204 3.1/3.2 - **Chemical Analysis:** Verified composition - **Mechanical Testing:** Tensile, hardness, impact tests - **Non-Destructive Examination:** RT, UT, MT, PT as specified - **Pressure Testing:** Hydrostatic or pneumatic testing - **Dimensional Inspection:** To specified tolerances **Traceability Requirements:** - **Heat Number Traceability:** Full material history - **Process Control:** Documented manufacturing processes - **Final Inspection:** Comprehensive quality verification - **Certification Packages:** Complete documentation provided --- #### **11. Key Advantages** * **Superior Corrosion Resistance:** Excellent performance in sour service and chloride environments * **High Strength Capability:** Maintains mechanical properties at elevated temperatures * **Reliable Performance:** Proven in critical service applications * **Industry Compliance:** Meets major international standards and specifications * **Versatile Applications:** Suitable for various fitting types and services * **Long Service Life:** Reduced maintenance and replacement costs * **Quality Assurance:** Comprehensive testing and certification * **Global Availability:** Standard and custom fittings available Alloy 925 fittings provide engineers and operators with reliable, high-performance connection solutions for the most demanding corrosive service applications, offering exceptional resistance to sour gas environments, chloride stress corrosion cracking, and general corrosion while maintaining high mechanical strength and pressure containment capabilities.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2009 gallon liquid totes Special package is available on request.